M. Heydari-Malayeri - Paris Observatory

An irregular galaxy that is much smaller than other irregulars.
Dwarf irregulars are generally metal poor and have relatively high fractions of gas.
They are thought to be similar to the earliest galaxies that populated the Universe, and
are therefore important to understand the
overall evolution of galaxies.

A dwarf irregular galaxy, discovered in 1977, that is a member of the Local Group of galaxies.
It has a diameter of 1,500 light-years and lies about 3.5 million light-years away.
SagDIG contains as much as about 108 solar masses of H I gas and is one
of the most metal-poor galaxies. It should not be confused with the
→ Sagittarius Dwarf Elliptical Galaxy.